# -*- coding: utf-8 -*-
"""
Created on Wed May  4 08:30:36 2016

@author: xiaoniu29

The Video Widget example shows how to implement a video widget
using QtMultimedia's QAbstractVideoSurface.
"""


from PyQt5.QtCore import (pyqtSignal, pyqtSlot, Q_ARG, QAbstractItemModel,
        QFileInfo, qFuzzyCompare, QMetaObject, QModelIndex, QObject, Qt,
        QThread, QTime, QUrl)
from PyQt5.QtGui import QColor, qGray, QImage, QPainter, QPalette
from PyQt5.QtMultimedia import (QAbstractVideoBuffer, QMediaContent,
        QMediaMetaData, QMediaPlayer, QMediaPlaylist, QVideoFrame, QVideoProbe)
from PyQt5.QtMultimediaWidgets import QVideoWidget
from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog, QFileDialog,
        QFormLayout, QHBoxLayout, QLabel, QListView, QMessageBox, QPushButton,
        QSizePolicy, QSlider, QStyle, QToolButton, QVBoxLayout, QWidget)
  
  
class VideoWidget(QVideoWidget):
  
    def __init__(self, parent=None):
        super(VideoWidget, self).__init__(parent)
  
        self.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)
  
        p = self.palette()
        p.setColor(QPalette.Window, Qt.black)
        self.setPalette(p)
  
        self.setAttribute(Qt.WA_OpaquePaintEvent)
  
    def keyPressEvent(self, event):
        if event.key() == Qt.Key_Escape and self.isFullScreen():
            self.setFullScreen(False)
            event.accept()
        elif event.key() == Qt.Key_Enter and event.modifiers() & Qt.Key_Alt:
            self.setFullScreen(not self.isFullScreen())
            event.accept()
        else:
            super(VideoWidget, self).keyPressEvent(event)
  
    def mouseDoubleClickEvent(self, event):
        self.setFullScreen(not self.isFullScreen())
        event.accept()
  
  
class PlaylistModel(QAbstractItemModel):
  
    Title, ColumnCount = range(2)
  
    def __init__(self, parent=None):
        super(PlaylistModel, self).__init__(parent)
  
        self.m_playlist = None
  
    def rowCount(self, parent=QModelIndex()):
        return self.m_playlist.mediaCount() if self.m_playlist is not None and not parent.isValid() else 0
  
    def columnCount(self, parent=QModelIndex()):
        return self.ColumnCount if not parent.isValid() else 0
  
    def index(self, row, column, parent=QModelIndex()):
        return self.createIndex(row, column) if self.m_playlist is not None and not parent.isValid() and row >= 0 and row < self.m_playlist.mediaCount() and column >= 0 and column < self.ColumnCount else QModelIndex()
  
    def parent(self, child):
        return QModelIndex()
  
    def data(self, index, role=Qt.DisplayRole):
        if index.isValid() and role == Qt.DisplayRole:
            if index.column() == self.Title:
                location = self.m_playlist.media(index.row()).canonicalUrl()
                return QFileInfo(location.path()).fileName()
  
            return self.m_data[index]
  
        return None
  
    def playlist(self):
        return self.m_playlist
  
    def setPlaylist(self, playlist):
        if self.m_playlist is not None:
            self.m_playlist.mediaAboutToBeInserted.disconnect(
                    self.beginInsertItems)
            self.m_playlist.mediaInserted.disconnect(self.endInsertItems)
            self.m_playlist.mediaAboutToBeRemoved.disconnect(
                    self.beginRemoveItems)
            self.m_playlist.mediaRemoved.disconnect(self.endRemoveItems)
            self.m_playlist.mediaChanged.disconnect(self.changeItems)
  
        self.beginResetModel()
        self.m_playlist = playlist
  
        if self.m_playlist is not None:
            self.m_playlist.mediaAboutToBeInserted.connect(
                    self.beginInsertItems)
            self.m_playlist.mediaInserted.connect(self.endInsertItems)
            self.m_playlist.mediaAboutToBeRemoved.connect(
                    self.beginRemoveItems)
            self.m_playlist.mediaRemoved.connect(self.endRemoveItems)
            self.m_playlist.mediaChanged.connect(self.changeItems)
  
        self.endResetModel()
  
    def beginInsertItems(self, start, end):
        self.beginInsertRows(QModelIndex(), start, end)
  
    def endInsertItems(self):
        self.endInsertRows()
  
    def beginRemoveItems(self, start, end):
        self.beginRemoveRows(QModelIndex(), start, end)
  
    def endRemoveItems(self):
        self.endRemoveRows()
  
    def changeItems(self, start, end):
        self.dataChanged.emit(self.index(start, 0),
                self.index(end, self.ColumnCount))
  
  
class PlayerControls(QWidget):
  
    play = pyqtSignal()
    pause = pyqtSignal()
    stop = pyqtSignal()
    next = pyqtSignal()
    previous = pyqtSignal()
    changeVolume = pyqtSignal(int)
    changeMuting = pyqtSignal(bool)
    changeRate = pyqtSignal(float)
  
    def __init__(self, parent=None):
        super(PlayerControls, self).__init__(parent)
  
        self.playerState = QMediaPlayer.StoppedState
        self.playerMuted = False
  
        self.playButton = QToolButton(clicked=self.playClicked)
        self.playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))
  
        self.stopButton = QToolButton(clicked=self.stop)
        self.stopButton.setIcon(self.style().standardIcon(QStyle.SP_MediaStop))
        self.stopButton.setEnabled(False)
  
        self.nextButton = QToolButton(clicked=self.next)
        self.nextButton.setIcon(
                self.style().standardIcon(QStyle.SP_MediaSkipForward))
  
        self.previousButton = QToolButton(clicked=self.previous)
        self.previousButton.setIcon(
                self.style().standardIcon(QStyle.SP_MediaSkipBackward))
  
        self.muteButton = QToolButton(clicked=self.muteClicked)
        self.muteButton.setIcon(
                self.style().standardIcon(QStyle.SP_MediaVolume))
  
        self.volumeSlider = QSlider(Qt.Horizontal,
                sliderMoved=self.changeVolume)
        self.volumeSlider.setRange(0, 100)
  
        self.rateBox = QComboBox(activated=self.updateRate)
        self.rateBox.addItem("0.5x", 0.5)
        self.rateBox.addItem("1.0x", 1.0)
        self.rateBox.addItem("2.0x", 2.0)
        self.rateBox.setCurrentIndex(1)
  
        layout = QHBoxLayout()
        layout.setContentsMargins(0, 0, 0, 0)
        layout.addWidget(self.stopButton)
        layout.addWidget(self.previousButton)
        layout.addWidget(self.playButton)
        layout.addWidget(self.nextButton)
        layout.addWidget(self.muteButton)
        layout.addWidget(self.volumeSlider)
        layout.addWidget(self.rateBox)
        self.setLayout(layout)
  
    def state(self):
        return self.playerState
  
    def setState(self,state):
        if state != self.playerState:
            self.playerState = state
  
            if state == QMediaPlayer.StoppedState:
                self.stopButton.setEnabled(False)
                self.playButton.setIcon(
                        self.style().standardIcon(QStyle.SP_MediaPlay))
            elif state == QMediaPlayer.PlayingState:
                self.stopButton.setEnabled(True)
                self.playButton.setIcon(
                        self.style().standardIcon(QStyle.SP_MediaPause))
            elif state == QMediaPlayer.PausedState:
                self.stopButton.setEnabled(True)
                self.playButton.setIcon(
                        self.style().standardIcon(QStyle.SP_MediaPlay))
  
    def volume(self):
        return self.volumeSlider.value()
  
    def setVolume(self, volume):
        self.volumeSlider.setValue(volume)
  
    def isMuted(self):
        return self.playerMuted
  
    def setMuted(self, muted):
        if muted != self.playerMuted:
            self.playerMuted = muted
  
            self.muteButton.setIcon(
                    self.style().standardIcon(
                            QStyle.SP_MediaVolumeMuted if muted else QStyle.SP_MediaVolume))
  
    def playClicked(self):
        if self.playerState in (QMediaPlayer.StoppedState, QMediaPlayer.PausedState):
            self.play.emit()
        elif self.playerState == QMediaPlayer.PlayingState:
            self.pause.emit()
  
    def muteClicked(self):
        self.changeMuting.emit(not self.playerMuted)
  
    def playbackRate(self):
        return self.rateBox.itemData(self.rateBox.currentIndex())
  
    def setPlaybackRate(self, rate):
        for i in range(self.rateBox.count()):
            if qFuzzyCompare(rate, self.rateBox.itemData(i)):
                self.rateBox.setCurrentIndex(i)
                return
  
        self.rateBox.addItem("%dx" % rate, rate)
        self.rateBox.setCurrentIndex(self.rateBox.count() - 1)
  
    def updateRate(self):
        self.changeRate.emit(self.playbackRate())
  
  
class FrameProcessor(QObject):
  
    histogramReady = pyqtSignal(list)
  
    @pyqtSlot(QVideoFrame, int)
    def processFrame(self, frame, levels):
        histogram = [0.0] * levels
  
        if levels and frame.map(QAbstractVideoBuffer.ReadOnly):
            pixelFormat = frame.pixelFormat()
  
            if pixelFormat == QVideoFrame.Format_YUV420P or pixelFormat == QVideoFrame.Format_NV12:
                # Process YUV data.
                bits = frame.bits()
                for idx in range(frame.height() * frame.width()):
                    histogram[(bits[idx] * levels) >> 8] += 1.0
            else:
                imageFormat = QVideoFrame.imageFormatFromPixelFormat(pixelFormat)
                if imageFormat != QImage.Format_Invalid:
                    # Process RGB data.
                    image = QImage(frame.bits(), frame.width(), frame.height(), imageFormat)
  
                    for y in range(image.height()):
                        for x in range(image.width()):
                            pixel = image.pixel(x, y)
                            histogram[(qGray(pixel) * levels) >> 8] += 1.0
  
            # Find the maximum value.
            maxValue = 0.0
            for value in histogram:
                if value > maxValue:
                    maxValue = value
  
            # Normalise the values between 0 and 1.
            if maxValue > 0.0:
                for i in range(len(histogram)):
                    histogram[i] /= maxValue
  
            frame.unmap()
  
        self.histogramReady.emit(histogram)
  
  
class HistogramWidget(QWidget):
  
    def __init__(self, parent=None):
        super(HistogramWidget, self).__init__(parent)
  
        self.m_levels = 128
        self.m_isBusy = False
        self.m_histogram = []
        self.m_processor = FrameProcessor()
        self.m_processorThread = QThread()
  
        self.m_processor.moveToThread(self.m_processorThread)
        self.m_processor.histogramReady.connect(self.setHistogram)
  
    def __del__(self):
        self.m_processorThread.quit()
        self.m_processorThread.wait(10000)
  
    def setLevels(self, levels):
        self.m_levels = levels
  
    def processFrame(self, frame):
        if self.m_isBusy:
            return
  
        self.m_isBusy = True
        QMetaObject.invokeMethod(self.m_processor, 'processFrame',
                Qt.QueuedConnection, Q_ARG(QVideoFrame, frame),
                Q_ARG(int, self.m_levels))
  
    @pyqtSlot(list)
    def setHistogram(self, histogram):
        self.m_isBusy = False
        self.m_histogram = list(histogram)
        self.update()
  
    def paintEvent(self, event):
        painter = QPainter(self)
  
        if len(self.m_histogram) == 0:
            painter.fillRect(0, 0, self.width(), self.height(),
                    QColor.fromRgb(0, 0, 0))
            return
  
        barWidth = self.width() / float(len(self.m_histogram))
  
        for i, value in enumerate(self.m_histogram):
            h = value * self.height()
            # Draw the level.
            painter.fillRect(barWidth * i, self.height() - h,
                    barWidth * (i + 1), self.height(), Qt.red)
            # Clear the rest of the control.
            painter.fillRect(barWidth * i, 0, barWidth * (i + 1),
                    self.height() - h, Qt.black)
  
  
class Player(QWidget):
  
    fullScreenChanged = pyqtSignal(bool)
  
    def __init__(self, playlist, parent=None):
        super(Player, self).__init__(parent)
  
        self.colorDialog = None
        self.trackInfo = ""
        self.statusInfo = ""
        self.duration = 0
  
        self.player = QMediaPlayer()
        self.playlist = QMediaPlaylist()
        self.player.setPlaylist(self.playlist)
  
        self.player.durationChanged.connect(self.durationChanged)
        self.player.positionChanged.connect(self.positionChanged)
        self.player.metaDataChanged.connect(self.metaDataChanged)
        self.playlist.currentIndexChanged.connect(self.playlistPositionChanged)
        self.player.mediaStatusChanged.connect(self.statusChanged)
        self.player.bufferStatusChanged.connect(self.bufferingProgress)
        self.player.videoAvailableChanged.connect(self.videoAvailableChanged)
        self.player.error.connect(self.displayErrorMessage)
  
        self.videoWidget = VideoWidget()
        self.player.setVideoOutput(self.videoWidget)
  
        self.playlistModel = PlaylistModel()
        self.playlistModel.setPlaylist(self.playlist)
  
        self.playlistView = QListView()
        self.playlistView.setModel(self.playlistModel)
        self.playlistView.setCurrentIndex(
                self.playlistModel.index(self.playlist.currentIndex(), 0))
  
        self.playlistView.activated.connect(self.jump)
  
        self.slider = QSlider(Qt.Horizontal)
        self.slider.setRange(0, self.player.duration() / 1000)
  
        self.labelDuration = QLabel()
        self.slider.sliderMoved.connect(self.seek)
  
        self.labelHistogram = QLabel()
        self.labelHistogram.setText("Histogram:")
        self.histogram = HistogramWidget()
        histogramLayout = QHBoxLayout()
        histogramLayout.addWidget(self.labelHistogram)
        histogramLayout.addWidget(self.histogram, 1)
  
        self.probe = QVideoProbe()
        self.probe.videoFrameProbed.connect(self.histogram.processFrame)
        self.probe.setSource(self.player)
  
        openButton = QPushButton("Open", clicked=self.open)
  
        controls = PlayerControls()
        controls.setState(self.player.state())
        controls.setVolume(self.player.volume())
        controls.setMuted(controls.isMuted())
  
        controls.play.connect(self.player.play)
        controls.pause.connect(self.player.pause)
        controls.stop.connect(self.player.stop)
        controls.next.connect(self.playlist.next)
        controls.previous.connect(self.previousClicked)
        controls.changeVolume.connect(self.player.setVolume)
        controls.changeMuting.connect(self.player.setMuted)
        controls.changeRate.connect(self.player.setPlaybackRate)
        controls.stop.connect(self.videoWidget.update)
  
        self.player.stateChanged.connect(controls.setState)
        self.player.volumeChanged.connect(controls.setVolume)
        self.player.mutedChanged.connect(controls.setMuted)
  
        self.fullScreenButton = QPushButton("FullScreen")
        self.fullScreenButton.setCheckable(True)
  
        self.colorButton = QPushButton("Color Options...")
        self.colorButton.setEnabled(False)
        self.colorButton.clicked.connect(self.showColorDialog)
  
        displayLayout = QHBoxLayout()
        displayLayout.addWidget(self.videoWidget, 2)
        displayLayout.addWidget(self.playlistView)
  
        controlLayout = QHBoxLayout()
        controlLayout.setContentsMargins(0, 0, 0, 0)
        controlLayout.addWidget(openButton)
        controlLayout.addStretch(1)
        controlLayout.addWidget(controls)
        controlLayout.addStretch(1)
        controlLayout.addWidget(self.fullScreenButton)
        controlLayout.addWidget(self.colorButton)
  
        layout = QVBoxLayout()
        layout.addLayout(displayLayout)
        hLayout = QHBoxLayout()
        hLayout.addWidget(self.slider)
        hLayout.addWidget(self.labelDuration)
        layout.addLayout(hLayout)
        layout.addLayout(controlLayout)
        layout.addLayout(histogramLayout)
  
        self.setLayout(layout)
  
        if not self.player.isAvailable():
            QMessageBox.warning(self, "Service not available",
                    "The QMediaPlayer object does not have a valid service.\n"
                    "Please check the media service plugins are installed.")
  
            controls.setEnabled(False)
            self.playlistView.setEnabled(False)
            openButton.setEnabled(False)
            self.colorButton.setEnabled(False)
            self.fullScreenButton.setEnabled(False)
  
        self.metaDataChanged()
  
        self.addToPlaylist(playlist)
  
    def open(self):
        fileNames, _ = QFileDialog.getOpenFileNames(self, "Open Files")
        self.addToPlaylist(fileNames)
  
    def addToPlaylist(self, fileNames):
        for name in fileNames:
            fileInfo = QFileInfo(name)
            if fileInfo.exists():
                url = QUrl.fromLocalFile(fileInfo.absoluteFilePath())
                if fileInfo.suffix().lower() == 'm3u':
                    self.playlist.load(url)
                else:
                    self.playlist.addMedia(QMediaContent(url))
            else:
                url = QUrl(name)
                if url.isValid():
                    self.playlist.addMedia(QMediaContent(url))
  
    def durationChanged(self, duration):
        duration /= 1000
  
        self.duration = duration
        self.slider.setMaximum(duration)
  
    def positionChanged(self, progress):
        progress /= 1000
  
        if not self.slider.isSliderDown():
            self.slider.setValue(progress)
  
        self.updateDurationInfo(progress)
  
    def metaDataChanged(self):
        if self.player.isMetaDataAvailable():
            self.setTrackInfo("%s - %s" % (
                    self.player.metaData(QMediaMetaData.AlbumArtist),
                    self.player.metaData(QMediaMetaData.Title)))
  
    def previousClicked(self):
        # Go to the previous track if we are within the first 5 seconds of
        # playback.  Otherwise, seek to the beginning.
        if self.player.position() <= 5000:
            self.playlist.previous()
        else:
            self.player.setPosition(0)
  
    def jump(self, index):
        if index.isValid():
            self.playlist.setCurrentIndex(index.row())
            self.player.play()
  
    def playlistPositionChanged(self, position):
        self.playlistView.setCurrentIndex(
                self.playlistModel.index(position, 0))
  
    def seek(self, seconds):
        self.player.setPosition(seconds * 1000)
  
    def statusChanged(self, status):
        self.handleCursor(status)
  
        if status == QMediaPlayer.LoadingMedia:
            self.setStatusInfo("Loading...")
        elif status == QMediaPlayer.StalledMedia:
            self.setStatusInfo("Media Stalled")
        elif status == QMediaPlayer.EndOfMedia:
            QApplication.alert(self)
        elif status == QMediaPlayer.InvalidMedia:
            self.displayErrorMessage()
        else:
            self.setStatusInfo("")
  
    def handleCursor(self, status):
        if status in (QMediaPlayer.LoadingMedia, QMediaPlayer.BufferingMedia, QMediaPlayer.StalledMedia):
            self.setCursor(Qt.BusyCursor)
        else:
            self.unsetCursor()
  
    def bufferingProgress(self, progress):
        self.setStatusInfo("Buffering %d%" % progress)
  
    def videoAvailableChanged(self, available):
        if available:
            self.fullScreenButton.clicked.connect(
                    self.videoWidget.setFullScreen)
            self.videoWidget.fullScreenChanged.connect(
                    self.fullScreenButton.setChecked)
  
            if self.fullScreenButton.isChecked():
                self.videoWidget.setFullScreen(True)
        else:
            self.fullScreenButton.clicked.disconnect(
                    self.videoWidget.setFullScreen)
            self.videoWidget.fullScreenChanged.disconnect(
                    self.fullScreenButton.setChecked)
  
            self.videoWidget.setFullScreen(False)
  
        self.colorButton.setEnabled(available)
  
    def setTrackInfo(self, info):
        self.trackInfo = info
  
        if self.statusInfo != "":
            self.setWindowTitle("%s | %s" % (self.trackInfo, self.statusInfo))
        else:
            self.setWindowTitle(self.trackInfo)
  
    def setStatusInfo(self, info):
        self.statusInfo = info
  
        if self.statusInfo != "":
            self.setWindowTitle("%s | %s" % (self.trackInfo, self.statusInfo))
        else:
            self.setWindowTitle(self.trackInfo)
  
    def displayErrorMessage(self):
        self.setStatusInfo(self.player.errorString())
  
    def updateDurationInfo(self, currentInfo):
        duration = self.duration
        if currentInfo or duration:
            currentTime = QTime((currentInfo/3600)%60, (currentInfo/60)%60,
                    currentInfo%60, (currentInfo*1000)%1000)
            totalTime = QTime((duration/3600)%60, (duration/60)%60,
                    duration%60, (duration*1000)%1000);
  
            format = 'hh:mm:ss' if duration > 3600 else 'mm:ss'
            tStr = currentTime.toString(format) + " / " + totalTime.toString(format)
        else:
            tStr = ""
  
        self.labelDuration.setText(tStr)
  
    def showColorDialog(self):
        if self.colorDialog is None:
            brightnessSlider = QSlider(Qt.Horizontal)
            brightnessSlider.setRange(-100, 100)
            brightnessSlider.setValue(self.videoWidget.brightness())
            brightnessSlider.sliderMoved.connect(
                    self.videoWidget.setBrightness)
            self.videoWidget.brightnessChanged.connect(
                    brightnessSlider.setValue)
  
            contrastSlider = QSlider(Qt.Horizontal)
            contrastSlider.setRange(-100, 100)
            contrastSlider.setValue(self.videoWidget.contrast())
            contrastSlider.sliderMoved.connect(self.videoWidget.setContrast)
            self.videoWidget.contrastChanged.connect(contrastSlider.setValue)
  
            hueSlider = QSlider(Qt.Horizontal)
            hueSlider.setRange(-100, 100)
            hueSlider.setValue(self.videoWidget.hue())
            hueSlider.sliderMoved.connect(self.videoWidget.setHue)
            self.videoWidget.hueChanged.connect(hueSlider.setValue)
  
            saturationSlider = QSlider(Qt.Horizontal)
            saturationSlider.setRange(-100, 100)
            saturationSlider.setValue(self.videoWidget.saturation())
            saturationSlider.sliderMoved.connect(
                    self.videoWidget.setSaturation)
            self.videoWidget.saturationChanged.connect(
                    saturationSlider.setValue)
  
            layout = QFormLayout()
            layout.addRow("Brightness", brightnessSlider)
            layout.addRow("Contrast", contrastSlider)
            layout.addRow("Hue", hueSlider)
            layout.addRow("Saturation", saturationSlider)
  
            button = QPushButton("Close")
            layout.addRow(button)
  
            self.colorDialog = QDialog(self)
            self.colorDialog.setWindowTitle("Color Options")
            self.colorDialog.setLayout(layout)
  
            button.clicked.connect(self.colorDialog.close)
  
        self.colorDialog.show()
  
  
if __name__ == '__main__':
  
    import sys
  
    app = QApplication(sys.argv)
  
    player = Player(sys.argv[1:])
    player.show()
  
    sys.exit(app.exec_())
  
